A simple syllogism-solving test: Empirical findings and implications for g research

Chizuru Shikishima, Shinji Yamagata, Kai Hiraishi, Yutaro Sugimoto, Kou Murayama, Juko Ando

研究成果: Article査読

8 被引用数 (Scopus)


It has been reported that the ability to solve syllogisms is highly g-loaded. In the present study, using a self-administered shortened version of a syllogism-solving test, the BAROCO Short, we examined whether robust findings generated by previous research regarding IQ scores were also applicable to BAROCO Short scores. Five syllogism-solving problems were included in a questionnaire as part of a postal survey conducted by the Keio Twin Research Center. Data were collected from 487 pairs of twins (1021 individuals) who were Japanese junior high or high school students (ages 13-18) and from 536 mothers and 431 fathers. Four findings related to IQ were replicated: 1) The mean level increased gradually during adolescence, stayed unchanged from the 30s to the early 50s, and subsequently declined after the late 50s. 2) The scores for both children and parents were predicted by the socioeconomic status of the family. 3) The genetic effect increased, although the shared environmental effect decreased during progression from adolescence to adulthood. 4) Children's scores were genetically correlated with school achievement. These findings further substantiate the close association between syllogistic reasoning ability and g.

出版ステータスPublished - 2011 3月

ASJC Scopus subject areas

  • 実験心理学および認知心理学
  • 発達心理学および教育心理学
  • 人文科学(その他)


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